HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
2-24
RPS6U rack power supply (ABE04x only)
OVERVIEW OF VM600 MPS HARDWARE
When two RPS6U rack power supplies are used to supply power to the cards in a VM600
rack, the maximum current available for use by the cards is limited to approximately 125%
(x 1.25) the current available from a single RPS6U because of the way in which the power
supplies share the load. In practice, the current load share can be anywhere between 20 to
80% (and 80 to 20%) due to imbalances.
For the later versions of the RPS6U power supply (330 W), a single RPS6U can support a
full rack of cards. For example, 12 x MPC4/IOC4T or 12 x XMx16/XIO16T card pairs can be
supported by one 330 W RPS6U for operating temperatures up to 50°C (122°F). This means
that a VM600 rack with two 330 W RPS6U power supplies installed and operating
non-redundantly is only typically only necessary for applications where the operating
environment requires RPS6U output power derating.
For the earlier versions of the RPS6U power supply (300 W), a single RPS6U cannot support
a full rack of cards. For example, 9 x MPC4/IOC4T or 6 x XMx16/XIO16T card pairs can be
supported by one 300 W RPS6U for operating temperatures up to 60°C (140°F). This means
that a VM600 rack with two 300 W RPS6U power supplies installed and operating
non-redundantly is typically necessary for applications using more than nine cards. Contact
your local Meggitt representative for further information.
2.10.7 VM600 racks and power supply redundancy
For VM600 racks, it is important to note and understand the differences between internal
power supply redundancy (that is, RPS6U rack power supply redundancy) and external
power supply redundancy (that is, mains power-supply system redundancy).
• Internal power supply redundancy
Internal rack power supply redundancy is RPS6U rack power supply redundancy. This
requires that two RPS6U rack power supplies are installed in the VM600 rack, so that
should one rack power supply fail, then the other rack power supply can continue to
supply power the cards in the rack (see 2.10.5 Racks with two RPS6U rack power
supplies in order to support rack power supply redundancy).
NOTE: Internal rack power supply redundancy requires that each RPS6U rack power
supply is capable of providing 100% of the power requirement of the cards in
the rack.
See Table 2-1 for a summary of the associated rear panels that are suitable for VM600
racks implementing internal power supply redundancy.
• External power supply redundancy
External power supply redundancy is mains power-supply system redundancy. This
requires that two external mains supplies (AC or DC) are used to supply power to the
VM600 rack, which can have one or two RPS6U rack power supplies installed. Should
one of the external mains supplies fail, then the other external mains supply can continue
to supply power to the RPS6U rack power supplies (and hence the cards) in the rack.
NOTE: External power-supply system redundancy requires two external mains
supplies that are both capable of providing 100% of the power requirement of
the RPS6U rack power supplies (and hence the cards) in the rack.
See Table 2-1 for a summary of the associated rear panels that are suitable for VM600
racks implementing external power supply redundancy.
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